New Thyrotropin Receptor Mutation in Neonate with Hyperthyroidism
Author Information
Author(s): Heike Biebermann, Franziska Winkler, Daniela Handke, Annette Grüters, Heiko Krude, Gunnar Kleinau
Primary Institution: Institute of Experimental Paediatric Endocrinology, Charité Universitätsmedizin Berlin
Hypothesis
The study investigates a new germline mutation in the thyrotropin receptor (TSHR) gene that causes non-autoimmune hyperthyroidism in a neonate.
Conclusion
A new TSHR germline mutation (I486N) was identified in a neonate with non-autoimmune sporadic hyperthyroidism, which affects signaling pathways differently than other mutations.
Supporting Evidence
- The mutation I486N was not found in the parents, indicating it is a new germline mutation.
- The patient exhibited tachycardia as the only clinical sign of hyperthyroidism.
- Functional assays showed that the mutant receptor had reduced cell surface localization and impaired Gq signaling.
Takeaway
A baby has a new mutation in a gene that controls thyroid hormones, which makes their heart race but doesn't cause other symptoms of hyperthyroidism.
Methodology
Sequencing of the TSHR gene exons 9 and 10 in a neonate, followed by functional characterization in cell lines.
Limitations
The study is based on a single case, limiting the generalizability of the findings.
Participant Demographics
A two-month-old neonate with no prior signs of hyperthyroidism.
Statistical Information
P-Value
<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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